基于能值理论的榆林市耕地可持续利用评价  

Evaluation of sustainable utilization of cultivated land in Yulin based on emergy theory

作　　者：杨梅焕[1] 曹明明[2] 朱志梅[2] 

机构地区：[1]西安科技大学测绘科学与技术学院,陕西西安710054 [2]西北大学城市与环境学院,陕西西安710127

出　　处：《干旱地区农业研究》2012年第3期227-233,共7页Agricultural Research in the Arid Areas

基　　金：国家自然科学基金(30700648);西安科技大学培育基金(2010006);西北大学研究生创新基金(08YZZ27)

摘　　要：应用能值理论对榆林市2003—2007年耕地系统的可持续性进行了评价。结果表明,在研究期内,榆林市耕地系统能值总投入并未大幅变动,其中购买能值投入逐年增加,不可更新资源环境投入呈降低趋势,2004年后购买能值所占比重最大,不可更新资源能值投入次之;对能值指标进行分析可以得到,该区域的发展更多地依赖于自然资源的投入,但依赖程度呈逐步降低的趋势。通过与其它区域耕地系统的对比可以得到,榆林市耕地系统存在发展水平较为滞后,农业机械化水平较低,发展严重依赖于自然资源的投入等问题;兼顾到该区域的农业发展水平并为维持区域的可持续性发展,提出该区域应大力发展有机农业和特色农业,在适度增加购买能值的基础上维持其可持续性。Emergy analysis was used to analyze cultivated land in Yulin area for the period from 2003--2007. The results showed that the total emergy input in these years was stable, among which the purchased emergy was increasing and the nonrenewable resources were decreasing, the purchased emergy occupied the first place and the nonrenewable re- sources took the second from 2004. The analysis of the emergy indicators showed that the development of the study area depended mostly on the input of natural resources. Comparison and analysis of different areas showed that there were some problems for the cultivated land in Yulin area, for example, mechanization level and development level were low, and the development depended too much on the input of natural resources. Thus, improving purchased emergy appropriately and developing organic agriculture are suggested for the sustainable development of the agro-ecosystem in Yulin area.

关 键 词：耕地系统 能值代数 能值指标 可持续性发展 榆林 

分 类 号：F301.21[经济管理—产业经济]